Monoazo pigments



United States Patent 3,197,457 MQNOAZG PIGMENTS Guido Schctty, Basel, Emil Stacker, Riehen, near Basel, and K rt E. Burdeslra, Basel, Switzerland, asslgnors to I. ll. A.-G., Basel, Switzerland No Drawing. Filed Nov. 26, 1962, der. No. 246L164 Claims priority, application Switzerland, Nov. 29, 196i, 13,862/61 6 tllaims. (til. Z-fifi-Ztld) The present invention concerns new monoazo pigments, a process for the production thereof, their use for the pigmenting of materials of all types and, as industrial product, the organic material pigmented therewith.

It has been found that valuable dyestuffs are obtained if diazotised l-amino-2,4-dichlorobenzene-S-carboxylic acid amide is coupled with a 2-hydroxynaphthalene-3- carboxylic acid arylamide of the formula CONER to form a monoazo pigment of Formula I In these formulae, R represents an unsubstituted naphthyl radical or a phenyl radical with to 3 substituents each or which is a methyl, ethyl, methoxy or ethcxy group or chlorine.

Among the pigments of the Formula 1 those in which R is phenyl, methylphenyl, dimethylphenyl, methoxyphenyl, ethoxyphenyl, dimethoxyphenyl, methoXy-niethylphenyl, methyl-chlorophenyl, methoXy-chlorophenyl, dimethoXy-chlorophenyl, chlorophenyl, dichlorophenyl and naphthyl are particularly interesting.

Very good properties as pigments are possessed by those compounds ccording to the invention in which R is a radical of the benzene series and which have the Formula ll wherein X is hydrogen, the methyl, methoxy or ethoxy group Y is hydrogen, the methyl, methoXy or ethoxy group or chlorine,

Z is hydrogen, the methoxy group or chlorine.

Optimal properties are shown by those compounds of the above Formula II in which X is in Z-position, Y is in 4-position and Z is in S-pcsition relative to the G-NH-bridge.

The diazotised l-amino 2,4 dichlorobenzene-S-carboxylic acid amide used according to the invention is obtained by reaction of 3 nitro 4,6 dichlorobenzoyl chloride with ammonia, reduction of the nitro group to the amino group and then diazotisation of the amine, e.g. in mineral acid aqueous dispersion with sodium nitrite.

The diazotised amine is coupled with the azo con: ponent in aqueous solution or dispersion in the usual way, preferably in acetic acid medium, if necessary at a raised temperature. To accelerate the coupling or to influence the form of the pigment formed, auxiliaries can be added to the coupling mixture, eg. organic solvents which are miscible with water such as lower alkanols, eg. methanol or ethanol, ether alcohols such as ethylene glycol monomethyl or monoethyl ether, lower aliphatic ketones, e.g. acetone, lower fatty acid amides such as dimethyl tormamide or certain tertiary nitrogen bases, e.g. pyridine bases, organic solvents which are not miscible with water uch as aromatic hydrocarbons, e.g. benzene, toluene, Xylene or tetrahydronaphthalene, also non-ionogenic, anion active or cation active dispersing agents, rosin soaps, protective colloids such as casein or methyl cellulose, also oils, plasticisers or solid colourless substrata such as barsulphate or aluminum hydroxide.

The new monazo pigments precipitate immediately after the coupling. They are isolated in the usual way by filtering oil and are purified by washing with water. ll dye powders are desired, the filter cakes are dried.

Generally, the pulverulent monoazo pigments can be used withoutany further treatment. it is also possible to subsequently change the physical properties of the pigments or to improve them, e.g. by treatment with chemically inert organic liquids at a raised temperature and by milling in the presence of milling auxiliaries which can easily be removed later such as water soluble inorganic salts and/ or organic solvents. in this way any undesirable substances also present can be removed; the particle size or form or the crystal structure can be altered and so the texture, shade, colour strength and fastness properties can be further improved. Also, however, the monoazo pigments can be further worked up as aqueous pastes or the water content thereof can be replaced by organic media.

The new dyestuffs are red to brown pigments; they are distinguished by their difficult solubility or insolubility in Water as well as in many usual organic solvents and they are also distinguished by their fastness to oil. They also have good to very good fastness to light, in many cases they have strong colour and a pure shade.

They are suitable in particular for printing colours of all types as well as for graphic printing, printing of synthetic substances, such as foils of polyvinylchloride, polyethylene, as well as of celluloseacetate and regenerated cellulose, pigment printing as well as pad dyeing of textiles. They can mso be used, however, for the pigmenting of various types of lacquers and paints, including dispersion colours, for the pigmenting of synthetic substances such as polyethylene polystyrene, polyesters hard polyvinyl chloride, melamine resins, urea-formaldehyde resins, condensation'products of phenol and epoxide resins, and of rubber, of spinning and moulding masses, e.g, for the production of coloured objects made of cellulose acetates or regenerated cellulose. They can also be used for the dyeing of paper in the mass, of masses to be used for coating in the production or leathercloth.

Further details can be seen from the following examples. Where not otherwise expressly stated, parts are given as parts by weight. The temperatures are given in degrees centigrade. The relationship of parts by Weight to parts by volume is as that of grammes to cubic centimetres.

EXAMPLE 1 4.10 parts of finely pulverised 1-amino-2,4-dichlorobenzene-S-carboxylic acid amide are added while stirring to 60 parts by volume of 2nhydrochloric acid and the whole is stirred for 16 hours. The suspension of the hydrochloric salt ofthe amine is cooled to 0 to 3 by the addition of 60 parts of ice and water and it is then diazotised with 20 parts by volume of 1n sodium nitrite solution. After adding 200 parts of ice water, the solution is clarified by filtration and 50 parts by volume of cold 9.11 sodium acetate solution are added.

A solution of 6.84 parts of 2-hydroxynaphthalene-3- diazo solution whereupon the suspension of the precipitated pigment is stirred for a short time with a high speed turbine-type stirrer. Then the reaction mixture is slowly heated to 60-65 until the coupling is substantially, complete. The pigment is filtered ,oif undersuction, washed with water and dried at 60-65 It is a beautiful scarlet which is fast to oil and toluene and very fast to light. It is suitable, for example, for graphic printing inks and paints.

EXAMPLE 2 If in the Example 1, instead of Z-hydroxynaphthalene- V 3-carboxylic acid-4Frnethoxyphenylamide, 6.33 parts of 2-hydroxyn-aphthalene-3-carboxylic acid-4'-ethoxyphenylamide are used and otherwise the same procedure as given in the Example 1 is followed, then a pigment of very similar properties is obtained.

' EXAMPLE 3 If 6. 66 parts of Z-hydroxynaphthalene-B-carboxylic -acid 2',5'-dimethoxyphenylamide is used instead of the amideused as coupling component in Example 1 while following otherwise the same procedure, then a blueish red pigment is obtained which has also fastness to light and very good fastness to oil and toluene.

EXAMPLE 4 ponents given in the following table are used, then other azo pigments according to the invention having similar properties are obtained.

Table 7 Example Coupling component Shade of N 0. pigment 5 2-hydroxynaphthalene-B-carboxylic acid2'- Scarlet.

methoxy-phenylamide. 6; 2-hydroxynaphthalene-S-carbcxylleacid-2- Do.

ethoxy-phenylamidc. 7 2-hydroxynaphthaIene-B-carboxylic acid-2- Do.

methoxy-5'-chlorophenylamide. 8 2-hydroxynaphthalene-3-carboxylic acid-2',4- Brownish dimethoxy-5-chlor0phenylamidc. red. 9 2-hydroxynaphthalenc-3-carboxylic acid-2,5- Blueish dimethoxy-4-cl1lorophenylamide. red. 10 2-hydr0xynaphthalene-3-carboxylic acid-4- Scarlet.

chlorophenylamide. 11 2-hydroxynaphthalene-3-carboxylic acid-2- Do.

methylphenylamide. 12 2-hydr0xynaphthalene 3-carboxy1icacid-2,4- Do.

. dimethylphenylaznide. 13 2-l1ydroxynaphthalene-3-carboxylie acid-2- D0.

1nethyl-4-chlorophenylarnide. 14 2-hydr0xynaphthalene-3-carboxylic acid-2- D0.

methy1-5-chlorophenylamide. 15 2-hydroxynaphthalene-3-carboxylic acid-1'- Brownlsh naphthylann'de. red. 16 Z-hydroxynaphthalene-B-carboxylic acid-2- Scarlet.

naphthylamide. 17 2-hydroxynaphthalene-3-carboxylic acid-3,4- Bed.

dichlorophenylamide.

EXAMPLE 18 20.8 parts of a mixed polymer from 15% vinyl acetate and 85% vinyl chloride are dissolved in 189 parts of cyclohexanone and 60.3 parts of methylethyl ketone, after which 4.0 parts of a finely ground paste of the pigr 4% ment produced according to are added. A homogeneous dispersion is obtained by milling in a ball mill. This printing ink can be printed by the intaglio printing process for example on polyvinyl chloride sheets and it is fixed bydrying in the air.

We claim:

1. A compound of the formula z I ooNH, 0H CONH 2 Q g t Y o1 N=N' X I wherein 1 I X is a member selected from the group consisting of hydrogen, methyl, and methoxy; Y is a member selected from the group consisting of methyl, methoxy, ethoxy, and chlorine; Z is a member selected from the group consisting of hydrogen, and chlorine. 2 2. The compound of the formula GONE; 111 oo-mr-O-oom o1- 'N=1 V 3. The compound of the formula I GONH; on ooNE 0oH3 o1- N=N- JJHa i 4. Thecompound of the formula CONH or: o0-NH- o1 o1 -N=N bCHa 5. The compound of theformula O1 l CONE; OH oo-NH o1 N=N- 1H;

6. The compound of the formula (llONH on (JO-NH- V C1-- N=N l g References Cited by the Examiner UNITED STATES PATENTS 1,916,621 7/33 Kracker 260-204 1,992,461 2/35 Baltes et a1. 260--204 2,899,421 8/54 Fischer 7 260-204 7 FOREIGN PATENTS 921,592 12/54 Germany.

CHARLES B. PARKER, Primary Examiner;

Example 1 in dioctyl phthalate 

1. A COMPOUND OF THE FORMULA 